package com.example.filter;

import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;

import java.io.IOException;

//@WebFilter(urlPatterns = "/login")
public class DemoFilter implements Filter {
    @Override//初始化，只调用一次
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("初始化方法执行了");

    }

    @Override//拦截到请求之后调用，调用多次
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("demo 拦截到了请求...放行前逻辑");

        //放行
        filterChain.doFilter(servletRequest, servletResponse);

        System.out.println(" demo 拦截到了请求...放行后逻辑");
    }

    @Override//销毁方法，值调用一次
    public void destroy() {
        System.out.println("销毁方法执行了");
    }
}
